Disconnect and lock out the breaker for the drum drive motor.
Set the drum plant at the desired slope (normally ¾ per 12) Use levelling blocks on plant for this purpose.
Level the plant from side to side.
Determine that the distance between the front trunnions Is the same as between the rear trunnions. Adjust If
Align the trunnions so they are on the same plane as the drum tire See figure 3-7.
Place a straight edge In position A-A and measure the distance from the straight edge to the tire - call this distance
A Place a straight edge in position B-B and measure the distance from the straight edge to the tire, call this
distance B. At point of contact measure the distance from the trunnion to the tire - call this distance X. All
dimensions A, B, and X should be the same (within 1/16).
If they differ:
Use X as a base
If B differs from X shim under the appropriate bearing.
If A differs from X adjust the bearings with the push screws.
After aligning all four trunnions proceed.
Securely bolt down all bearings
Remove padlock from the breaker and turn breaker on Start the drum
Adjust the drum as described In paragraph A
Stop the drum and check the contact area (with feeler gauge) between each trunnion roller and tire There should
be a minimum 50% contact.
When the drum Is aligned, check all bearings are securely bolted down and lock the bearing adjustment screws In
place with their locking nuts.
Re-align the drive, if necessary See section 3-3-4.